Tagged: Spinel

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Fine Jewelry University

  1. Gem in the Spotlight: Ruby

    Is it Ruby’s color that we love? Or is it Ruby’s beauty? Is it Ruby’s rarity, thereby is high cost? What ever it is, Ruby’s impact on humans is broad and deep. Ruby is the red variety of corundum. Any other color of corundum is called a Sapphire. The red color in ruby is caused by trace amounts of the element chromium. Ruby is 9 on the Mohs hardness scale. Ruby is the accepted birthstone for July. It is also the anniversary gemstone for the 15th and 40th year. Rubies are sturdy stones, but are still vulnerable to breakage and chipping... read more »